The traditional model of time preferences employed by economists is ch
aracterised by constant timing aversion. The available evidence sugges
ts that this is not an appropriate assumption. This paper examines evi
dence for constant and decreasing timing aversion with respect to savi
ng lives. Three discounting models are considered: the constant discou
nting model; the proportional discounting model; and the hyperbolic di
scounting model. Data collected from the general public are used to te
st the constant timing aversion model. Overall, the findings suggest t
hat there is substantial evidence for decreasing timing aversion and a
gainst the constant timing aversion hypothesis. (C) 1997 Elsevier Scie
nce Ltd.